QUOTE (DireRadiant @ Apr 9 2010, 03:06 PM)

The effects of the activated foci that went with you went you went from physical to astral should also come into play when you materialize. It's the psychic power that is being given material form when you Materialize. You are astral goo made real, since that astral goo had +1 power focus, so does the materialized one. Don't think of the foci in astral space as a physical object, but as a power or ability your astral form has, when that astral form Materializes, then it has that power as well.
That's wat I initially thought as well, but the RAW specifically state that Foci acompany your astral form as individual astral forms:
QUOTE (p.199 SR4A)
When activated, foci have an astral form and will accompany an astrally projecting magician to which they are bound. A projecting magician must activate any foci she wishes to take with her in advance (though she can deactivate them at any time).
Since they are individual astral forms, they will not materialize with you. They will remain with you as purely astral forms, though.
QUOTE (DireRadiant @ Apr 9 2010, 03:06 PM)

Thought experiment. If you have an active foci when you astrally project, are you able to separate yourself from it while astral? If you can, how does this affect things when you stop astrally projecting?
You can willingly deactivate a focus you have with you while astraly projecting, effectively seperating yourself from it (the astral form of the focus vanishes).
QUOTE (DireRadiant @ Apr 9 2010, 03:06 PM)

It would seem "safer" to go with the concept that the act of astrally projecting creates a singular astral form that has attributes of both the projecting mage and the active foci. Note that this doesn't prevent another astral form from specifically targeting the active foci, it can be treated as a called target.
I agree that this would be the most convenient way, but that's not how it is in SR4. I was mistaken about that myself.